/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.linkis.cli.application.observer.event;

import org.apache.linkis.cli.application.observer.listener.LinkisClientListener;

public abstract class SingleObserverEvent implements LinkisClientEvent {
    private LinkisClientListener observer;

    @Override
    public boolean isRegistered() {
        return observer != null;
    }

    @Override
    public void register(LinkisClientListener observer) {
        this.observer = observer;
    }

    @Override
    public void unRegister(LinkisClientListener observer) {
        this.observer = null;
    }

    @Override
    public void notifyObserver(LinkisClientEvent event, Object message) {
        observer.update(event, message);
    }
}
